meta-lxatac-bsp: lxatac-factory-data: run script before udev starts

This makes sure that our tac-bridge.link file is ready before udev
reads it. We have previously run into race conditions where the
file was not present at the correct point in time, resulting in the
bridge interface coming up with the wrong MAC address.

Signed-off-by: Leonard Göhrs <l.goehrs@pengutronix.de>

meta-lxatac-bsp/recipes-core/lxatac-factory-data/files/lxatac-factory-data.service

@@ -1,10 +1,13 @@
 [Unit]
 Description=Gather and Distribute Factory Data
-Before=NetworkManager.service
+DefaultDependencies=no
+After=systemd-remount-fs.service
+Before=systemd-udevd.service
+RequiresMountsFor=/run
 
 [Service]
 Type=oneshot
 ExecStart=/usr/sbin/lxatac-factory-data
 
 [Install]
-WantedBy=multi-user.target
+WantedBy=sysinit.target

meta-lxatac-bsp/recipes-core/lxatac-factory-data/files/lxatac-factory-data.sh

@@ -11,14 +11,12 @@ DST_LINK_FILE_BASE="/run/systemd/network/"
 mkdir -p "${DST_ENVS_BASE}"
 mkdir -p "${DST_LINK_FILE_BASE}"
 
-# Set the static hostname if it is not set yet
-# (The transient hostname is passed via systemd.hostname= commandline)
-# --------------------------------------------------------------------
+# If no hostname is set yet persist the one we currently have
+# -----------------------------------------------------------
 
 if [[ ! -e /etc/hostname ]]
 then
-    hostname="$(hostnamectl --transient hostname)"
-    hostnamectl --static hostname "${hostname}"
+    hostname > /etc/hostname
 fi
 
 # Read Factory Data passed to us by barebox via the devicetree
@@ -67,4 +65,3 @@ OriginalName=tac-bridge
 MACAddress=${MAC_BRIDGE}
 MACAddressPolicy=none
 EOF
-